KR100332391B1 - Device for contactless transmission of electric energy - Google Patents

Abstract

The present invention relates to an apparatus for contactless transmission of energy from a primary current lead through which an alternating current (2) flows to a plurality of secondary resonant load circuits (100, 200), each resonant load circuit having a current lead (2). And at least one coil (5) that draws energy from the electromagnetic field. This inventive device is used, for example, in industrial assembly systems or personal passenger vehicles. A consumer device that draws little energy from the primary circuit interrupts the flow of current through the primary circuit and supplies it to other consumer devices. Known solutions require a decoupling device for each user. Therefore, the present invention allows multiple users to supply simple and independent energy to each other. For this purpose, the conductors 8 are arranged in parallel with the current conductors 2 connected through several connection points 10, 11. In addition, the regulating resistor 45 is fitted with at least one section of the lead 8 between two connection points 10, 11 and controlled by the monitoring device 43.

Description

Device for the transmission of contactless electrical energy {DEVICE FOR CONTACTLESS TRANSMISSION OF ELECTRIC ENERGY}

The present invention relates to an energy transmission device according to the preamble of claim 1.

This type of energy transfer device is used to transfer electrical energy from the normal current lead of the primary circuit to the secondary circuit of the mobile consumer. Possible applications are, for example, industrial assembly systems or passenger vehicles.

In this case, contactless inductive energy transfer is advantageous. This makes it possible to omit the sliding contact which is easy to wear. Moreover, the difficulty of protecting the exposed leads and the poor contact due to the contaminated leads when installing the current leads on the floor are eliminated. By installing conductors in the floor, ceiling or wall, the risk of tripping of conventional current transfer rails can be eliminated.

Known systems can be a problem when concurrently used by multiple consumers. This is due to the interaction between the consuming device and the normal current lead.

In normal operation, alternating current flows through the primary circuit. The secondary circuit of the consuming device forms a resonant circuit that is coupled with the primary circuit through the coil and resonates at the frequency of the primary circuit.

If the consuming device draws little energy from the primary circuit, this means that the impedance within the load circuit is increased. This impedance is reflected in the primary circuit by the transformer effect. Increasing the impedance in the primary circuit impedes the flow of current through the primary circuit and also impedes the supply to other consuming devices. If no energy is used, the coil of the consuming device completely blocks the flow of current in the primary conductor. Therefore, the consuming device can no longer operate independently of the first lead and their power consumption is not individually adjusted.

Such an attempt can be found in patent PCT 92/17929. In this case, an electrical or mechanical decoupling device is installed on each consumer device. However, this concept requires, for example, large scale decoupling devices, such as hydraulic pistons, to be transported on consumer device carriers.

WO 93/23909 describes a system in which the primary circuits have guidance loops arranged behind one another in the direction of travel. These guidance loops are bypassed and are not penetrated by current unless there is any consuming device in their field. However, in this case, the concept is a solution to the operation of several consumer devices, since some of the unused conductors are not broken, and instead several consumer devices are supplied with energy despite the interruption of the primary conductor. Does not present.

Therefore, it is an object of the present invention to design an energy transmission device that can easily supply energy independent of each other to various consuming devices.

This object is solved by characterizing claim 1.

Effective embodiments can be found in the dependent claims.

An example of an embodiment will be described in detail with reference to the accompanying drawings.

1 shows an induction energy transfer system according to the prior art.

2 shows an energy transmission device according to the invention.

The energy transmission device according to the prior art has a primary circuit having a current lead 2 which is energized via an alternating current power source 1. For the resonant operation of this circuit, capacitors 3 are provided in the current lead 2 at specific intervals.

In order to draw energy from the primary circuit, each of the current consuming devices 100 and 200 has a coil 5 wound on a U-shaped ferrite core 4, for example. The coil 5 is connected to the consumption resistor 7 via the current lead 6. This consumption resistor 7 can be, for example, a vehicle motor or a regulating circuit. Moreover, the secondary circuit has a device which serves as a capacitor applied to the coil 5 in parallel with the consumption resistor 7. This is necessary for the secondary circuit to form a resonant circuit. However, for the sake of clarity, the description of this capacitor is omitted.

If no high frequency alternating voltage is applied to the power source 1, alternating current flows through the current conductor 2. An electromagnetic field is formed around the current lead 2. This causes a load shift in the coil 5 due to the magnetization of the U type ferrite core. The high frequency change from the current lead 2 to the current direction causes a constant reversal of the electromagnetic field, causing a resonance change in the direction of the load movement in the coil 5. This induced alternating current can lead to the consumption resistance 7 via the lead 6.

2 shows an energy transmission device according to the invention. This system uses part of the primary circuit and consumer devices according to the prior art of FIG. The same components are denoted by the same symbols as in FIG.

The system comprises a primary current lead 2 with an alternating current power supply 1. The auxiliary lead 8 is arranged in parallel with the current lead 2. This auxiliary lead 8 is connected to the current lead 2 at specific intervals at the connection point 10. In this example, capacitors 3 have been selected as connection points. The monitoring device 43 is provided in the auxiliary lead 8 between each two connection points. Parallel to each monitoring device 43, a current branch 42 with a switch 41 can be arranged and opened and closed via the monitoring device 43.

If the consuming device 100 requires maximum power from the current lead 2, the monitoring device 43 in each section in question between the two adjacent connection points 10, 11 may turn the switch 41 open. Switch. In this way, no current can flow through the auxiliary conductor 8 because the monitoring device 43 and the open switch 41 are not conducting. In this case, the total current flows only through the current lead 2 and therefore along the coil 5 of the consuming device 100.

If the consuming device 100 requires a low power output, the monitoring device 43 closes the switch 41. As a result, current flows not only through the current lead 2, but also through the auxiliary lead 8 and the branch lead 42. In this way, current can flow from the first connection point 10 through the current lead 2 and through the auxiliary lead 8 and the branch lead 42 to the next connection point 11. The electromagnetic field of the current lead 2 is thus transmitted less strongly and with less power.

In order to continuously adjust the power of the consuming device, the switch 41 can be closed in a timed manner. By adjusting the pulse frequency or the keying ratio, the output value can be set between the maximum transmission when the switch is continuously opened and the minimum transmission when the switch is continuously closed.

The switch 41 can be permanently closed in order to prevent the conducting wire 2 from being disconnected by the disconnected consumer device 100. In this way, the total current is transmitted in section 10-11 via auxiliary conductor 8 and branch conductor 42 to the next junction 11.

The change in power required by the consuming device reacts to the primary circuit. As a result, the switch 41 can be controlled by the monitoring device 43 by measuring the voltage or the minimum testing current flow in the local auxiliary lead section 8. For the preset deviation value, the monitoring device 43 generates a switching pulse on the switch 41.

Another possibility for controlling the switch 41 is to send a signal from the consuming device 100 itself to the monitoring device 43. For this purpose, contactless data transmission devices are provided on the consuming device 100, 200 and the monitoring device 43. They may operate inductively, either wirelessly or in accordance with other known principles.

In this case, an independent monitoring device 43 can be provided in each lead section 8 as shown in FIG. 2. However, it is also possible to jointly control the various sections from the central monitoring device. To accomplish this, the consuming devices 100, 200 will, for example, send their signals to the common monitoring device 43. This monitoring apparatus can switch each switch 41 according to a requirement.

In one embodiment, a variable regulating resistor may be provided instead of the switch 41. In this case, the current flow through the auxiliary lead section 8 will be adjusted by adjusting the level of the adjustable resistance without opening and closing the switch.

Since the described power control is always associated with one section, it is desirable to fit the size of the section to the size of the consuming devices 100, 200. Another possibility for independent control of the individual consuming devices 100, 200 would be to maintain a sufficient operating interval.

Claims (11)

In a primary current lead 2 through which alternating current flows, a contactless point is provided to a plurality of secondary resonant load circuits 100 and 200 having at least one coil 5 which draws energy from an electromagnetic field of the current lead 2 respectively. In the device for energy transmission, The auxiliary lead 8 is arranged in parallel with the current lead 2 so that current can be conducted from the first connection point 10 to the second connection point 11 via the auxiliary lead 8. , 11) is connected to the current conductor (2), Controlled by the monitoring device 43 between at least two connection points 10, 11 in one section of the lead so as to prevent the lead 2 from being blocked by disconnected consumer devices 100, 200. An adjustable resistance (45) is provided on said auxiliary conductor (8). 2. Device according to claim 1, characterized in that the adjustable resistor (45) is formed by a switch (41) that can be opened and closed to switch the auxiliary lead (8) to a conductive or non-conductive state. Apparatus according to claim 1 or 2, characterized in that the connection point (10, 11) is in the form of a capacitor (3). Device according to claim 1 or 2, characterized in that the switch (41) is closed in a pulsed manner to control the power consumption of the consumer device (100, 200). 3. The monitoring device (43) according to claim 1 or 2, wherein the monitoring device (43) monitors the voltage at the adjustable resistor (45) of at least one lead section, so that the adjustable resistor (45) with respect to a specific change value of the voltage. Generating a control pulse for the device. 3. The monitoring device (43) according to claim 1 or 2, wherein the monitoring device (43) monitors the current flow in at least one lead section of the primary current lead (2) so that the adjustable resistance (< / RTI > Device for generating a control pulse. 3. The monitoring device (43) according to any one of the preceding claims, wherein the monitoring device (43) monitors the flow of testing current in at least one lead section of the auxiliary lead (2) so that the adjustable resistor (45) with respect to a specific change in the voltage. Device for generating a control pulse. Apparatus according to claim 1 or 2, characterized in that at least one consuming device (100, 200) has said contactless signal transmission device. The method according to claim 1 or 2, wherein the monitoring device (43) receives a signal from the consuming device (100, 200) transmitted in a contactless manner, and according to the signal for at least one adjustable resistor (45). Generating a control pulse. Apparatus according to claim 1 or 2, characterized in that the monitoring device (43) receives signals from several consumer devices (100, 200) and simultaneously controls several adjustable resistors (45). Apparatus according to claim 1 or 2, characterized in that an independent monitoring device (43) is arranged in at least one lead section (8) for controlling the locally adjustable resistor (45).